The VCO is frequency modulated by 1. it's own sine amplitude modulated by the ADSR, and 2. by the ADSR. The ADSR is running at audio rate in gated loop mode and is gated by the pulse wave from the VCO. The pulse width is modulated by the LFO triangle. The sine wave of the VCO is routed through the filters in the noise module, and the LPF is modulated by the infrared noise.
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